CN110612669B

CN110612669B - Decoding method and device

Info

Publication number: CN110612669B
Application number: CN201780090598.XA
Authority: CN
Inventors: 吴可镝; 魏岳军; 王旭
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-05-24
Filing date: 2017-05-24
Publication date: 2021-07-09
Anticipated expiration: 2037-05-24
Also published as: EP3624349B1; CN110612669A; US11477170B2; EP3624349A4; US20200092268A1; WO2018214070A1; EP3624349A1

Abstract

The disclosure provides a decoding method and device, and belongs to the field of communication. The method comprises the following steps: extracting at least one priori information from at least one first transport block which is successfully decoded historically, and forming a priori information set by the at least one priori information, wherein one priori information comprises the header information of a transport protocol layer of the first transport block; when a second transmission block to be decoded, which is sent by a sending end, is received, selecting first prior information from the prior information set, wherein the second transmission block is a transmission block obtained by coding a third transmission block by the sending end; and decoding the second transmission block according to the first prior information and the first demodulation information of the second transmission block to obtain the third transmission block. The device comprises: the device comprises a first extraction unit, a selection unit and a first decoding unit. The present disclosure decodes the second transport block by combining the first prior information and the first demodulation information, thereby improving the accuracy of decoding.

Description

Decoding method and device

Technical Field

The present disclosure relates to the field of communications, and in particular, to a decoding method and apparatus.

Background

In the current communication system, most of the Transmission traffic is Transmission traffic based on a Transmission Control Protocol (TCP). When the TCP server sends service data to the terminal in the process of executing the transmission service based on the TCP, the terminal receives the service data sent by the TCP server and sends feedback information to the TCP server. The feedback information may be an Acknowledgement (ACK). And the TCP server performs operations such as retransmission or continuous transmission according to the feedback information. For example, when the current communication system is a wireless mobile cellular communication system, the terminal forwards the feedback information to the TCP server through the base station; the specific process is as follows: the terminal carries out coding processing on the feedback information to obtain a transmission block containing the feedback information, the transmission block is sent to the base station, the base station decodes the transmission block and sends a decoding result obtained by decoding to the TCP server, and the TCP server receives the decoding result so as to acquire the feedback information sent by the terminal.

In the prior art, when a terminal sends the feedback information, the feedback information needs to be carried in header information of a transmission layer, the header information of the transmission layer is processed in a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Media Access Control (MAC) layer, and the processed information is encoded to generate a transmission block including the feedback information, where the process specifically includes: in the transport layer, the terminal carries the feedback information in transport layer header information and transmits the transport layer header information to the PDCP layer. In the PDCP layer, the terminal adds header information of the PDCP layer to header information of the transport layer, generates Protocol Data Unit (PDU) information, and transmits the PDU information to the RLC layer. The terminal segments and cascades the PDU information on the RLC layer, adds the header information of the RLC layer and sends the PDU information added with the header information of the RLC layer to the MAC layer. And the terminal continuously adds the head information of the MAC layer to the PDU information added with the head information of the RLC layer on the MAC layer, and codes the PDU information added with the head information of the RLC layer and the head information of the MAC layer to obtain a transmission block. The terminal transmits the transport block to the base station. The base station receives a transmission block sent by the terminal and decodes the transmission block, wherein the decoding process specifically comprises the following steps: the base station obtains the demodulation soft value of the transmission block, inputs the demodulation soft value and the transmission block into a channel decoder of a physical layer, and decodes the transmission block through the channel decoder.

In the course of implementing the present disclosure, the inventors found that the prior art has at least the following problems:

when the feedback information is coded to obtain the transmission block, information such as header information of a transmission layer, header information of a PDCP layer, header information of an RLC layer, header information of an MAC layer and the like is combined. However, when decoding a transport block, the transport block is decoded only according to the demodulation soft value, which results in a high error rate and a low accuracy of the decoding method.

Disclosure of Invention

In order to solve the problems in the prior art, the embodiments of the present disclosure provide a decoding method and apparatus. The technical scheme is as follows:

in a first aspect, a method for coding is provided, the method including:

extracting at least one priori information from at least one first transport block which is successfully decoded historically, and forming a priori information set by the at least one priori information, wherein one priori information comprises the header information of a transport protocol layer of the first transport block;

when a second transmission block to be decoded, which is sent by a sending end, is received, selecting first prior information from the prior information set, wherein the second transmission block is a transmission block obtained by coding a third transmission block by the sending end;

and decoding the second transmission block according to the first prior information and the first demodulation information of the second transmission block to obtain the third transmission block.

In the embodiment of the disclosure, a receiving end extracts prior information from at least one first transmission block successfully decoded in history to form a prior information set, where the prior information includes header information of a transmission protocol layer in the at least one first transmission block successfully decoded in history; when a second transmission block to be decoded, which is sent by a sending end, is received, a receiving end selects first prior information from the prior information set, wherein the second transmission block is a transmission block obtained by coding a third transmission block by the sending end; then, the receiving end decodes the second transmission block according to the first prior information and the first demodulation information of the second transmission block to obtain the third transmission block. The receiving end combines the first demodulation information and the first prior information to decode the second transmission block, and the first prior information comprises the header information of the transmission protocol layer in at least one first transmission block with successful historical decoding, so that the error rate of decoding the second transmission block by the receiving end is reduced, and the accuracy of decoding is improved.

In a first possible implementation manner of the first aspect, before the selecting the first priori information from the set of priori information, the method further includes:

decoding the second transmission block according to the first demodulation information to obtain a fourth transmission block;

if the fourth transport block and the third transport block are not the same, performing the step of selecting first prior information from the set of prior information.

In the embodiment of the disclosure, the receiving end decodes the second transmission block according to the first demodulation information of the second transmission block, and if the decoding fails, that is, the fourth transmission block is different from the third transmission block, the first priori information is selected, so that the receiving end can decode the second transmission block subsequently by combining the first priori information and the first demodulation information, thereby improving the decoding efficiency.

In a second possible implementation manner of the first aspect, the method further includes:

acquiring first check information and second check information, wherein the first check information is check information of the third transmission block, and the second check information is check information of the fourth transmission block;

and if the first check information is not the same as the second check information, determining that the fourth transmission block is not the same as the third transmission block.

In the embodiment of the disclosure, the receiving end obtains the first check information of the third transmission block and the first check information of the fourth transmission block, and determines whether the decoding of the second transmission block is successful according to the first check information and the second check information, so that the accuracy of determining whether the decoding is successful is improved.

In a third possible implementation manner of the first aspect, the extracting at least one piece of prior information from at least one first transport block that is decoded successfully historically, and grouping the at least one piece of prior information into a set of prior information includes:

obtaining the at least one first transport block;

extracting header information of a transport protocol layer in each of the at least one first transport block;

generating at least one priori information according to header information of a transport protocol layer in each of the at least one first transport block;

and forming the at least one prior information into the prior information set.

In the embodiment of the disclosure, the receiving end may extract the header information of the transport protocol layer in each first transport block, generate at least one piece of prior information from the header information of the transport protocol layer in each first transport block, and form the at least one piece of prior information into a prior information set, so that the receiving end may directly select the first prior information from the prior information set, thereby improving the efficiency of obtaining the first prior information by the receiving end.

In a fourth possible implementation manner of the first aspect, after the decoding the second transport block according to the first apriori information and the first demodulation information of the second transport block to obtain the third transport block, the method further includes:

extracting a priori information from the third transport block;

and updating the prior information set according to the extracted prior information.

In the embodiment of the disclosure, after the receiving end succeeds in decoding each time, the prior information is extracted from the third transmission block obtained successfully in decoding, and the prior information set is updated in real time according to the extracted prior information, so that the timeliness and the accuracy of the prior information set are ensured, and the accuracy of the receiving end obtaining the first prior information is improved.

In a fifth possible implementation manner of the first aspect, the decoding the second transport block according to the first apriori information and the first demodulation information of the second transport block to obtain the third transport block includes:

according to the first prior information, performing saturation processing on the first demodulation information to obtain second demodulation information;

and decoding the second transmission block according to the second demodulation information to obtain the third transmission block.

In the embodiment of the present disclosure, since the second demodulation information is obtained by performing saturation processing on the first demodulation information through the first priori information, the receiving end decodes the second transmission block according to the second demodulation information obtained by the saturation processing, thereby improving the accuracy of decoding.

In a sixth possible implementation manner of the first aspect, the decoding the second transport block according to the second demodulation information to obtain the third transport block includes:

decoding the second transmission block according to the second demodulation information to obtain a fifth transmission block;

if the fifth transmission block is different from the third transmission block, selecting second prior information from the prior information set, wherein the second prior information is any prior information except the first prior information in the prior information set;

and decoding the second transmission block according to the second prior information and the first demodulation information to obtain the third transmission block.

In the embodiment of the present disclosure, if the receiving end fails to decode the second transmission block according to the second demodulation information, that is, the fifth transmission block is different from the third transmission block, at this time, the receiving end may further continue to select the second priori information from the first priori information set, and decode the second transmission block again by combining the second priori information and the first demodulation information until the decoding is successful, that is, the receiving end obtains the third transmission block, and the receiving end performs secondary decoding on the second transmission block, so that the robustness of the decoding method is improved, and the accuracy of decoding the second transmission block by the receiving end is improved.

In a seventh possible implementation manner of the first aspect, the second transport block is a data block obtained by encrypting the third transport block by the sending end; the selecting first prior information from the set of prior information comprises:

selecting third prior information from the prior information set, wherein the third prior information is the prior information extracted by the receiving end from the encrypted first transmission block;

determining a first encryption key according to a sixth transport block, wherein the sixth transport block is a transport block successfully decoded last time of the second transport block;

and encrypting the third prior information through the first encryption key to obtain the first prior information.

In the embodiment of the disclosure, when the second transmission block is a data block obtained by encrypting the third transmission block by the sending end, the receiving end may determine the first encryption key according to the last successfully decoded transmission block of the second transmission block, that is, the sixth transmission block; the third prior information in the prior information set is encrypted through the first encryption key to obtain the first prior information, so that the receiving end can decode the encrypted second transmission block subsequently by combining the first prior information and the first demodulation information, and the applicability of the decoding method is improved.

In an eighth possible implementation manner of the first aspect, the determining a first encryption key according to the sixth transport block includes:

extracting a second encryption key from the sixth transport block;

and determining the first encryption key according to the second encryption key and a preset key algorithm.

In the embodiment of the disclosure, when the second transmission block is a data block obtained by encrypting the third transmission block by the sending end, the receiving end directly extracts the second encryption key from the sixth transmission block successfully decoded last transmission block of the second transmission block, and can determine the first encryption key according to the preset key algorithm and the second encryption key, thereby improving the efficiency of obtaining the first encryption key by the receiving end.

In a second aspect, an embodiment of the present disclosure provides a decoding apparatus, where the decoding apparatus includes at least one unit, and the at least one unit is configured to implement the decoding method provided in the first aspect or any one of the possible implementation manners of the first aspect.

In a third aspect, an embodiment of the present disclosure provides a system chip, which is applied in a receiving end, where the chip includes: an input-output interface, at least one processor, a memory, and a bus; the input/output interface is connected to the at least one processor and the memory through the bus, the input/output interface is used for communication between the receiving end and the transmitting end, and the at least one processor executes instructions stored in the memory, so that the receiving end executes the decoding method provided by any one of the above-mentioned first aspect or any one of the above-mentioned possible implementation manners.

In a fourth aspect, the embodiments of the present disclosure provide a computer storage medium for storing computer software instructions for a receiving end, which contains instructions for executing a program designed for the receiving end according to the first aspect described above.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

Drawings

FIG. 1 is a schematic diagram of an implementation environment for decoding provided by an embodiment of the present disclosure;

FIG. 2 is a flowchart of a method for decoding according to an embodiment of the disclosure;

FIG. 3 is a schematic diagram of a decoding process provided by an embodiment of the disclosure;

FIG. 4 is a block diagram of a decoding apparatus provided by an embodiment of the present disclosure;

FIG. 5 is a block diagram of a decoding apparatus provided by an embodiment of the present disclosure;

FIG. 6 is a block diagram of a decoding apparatus provided by an embodiment of the present disclosure;

FIG. 7 is a block diagram of a decoding apparatus provided by an embodiment of the present disclosure;

FIG. 8 is a block diagram of a decoding apparatus provided by an embodiment of the present disclosure;

fig. 9 is a block diagram of a decoding apparatus according to an embodiment of the disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.

Referring to fig. 1, fig. 1 is a schematic diagram of an implementation environment of decoding provided by the embodiment of the present disclosure, where the implementation environment includes a sending end 101 and a receiving end 102.

The sending end 101 and the receiving end 102 may communicate through a transmission protocol of a wireless communication system, where the wireless communication system may be any one of the following wireless communication systems, including but not limited to: a Long Term Evolution (LTE) System, a Universal Mobile Telecommunications System (UMTS), and the like; the wireless communication system may employ any one of the following transmission protocols, including but not limited to: transmission control Protocol, User Data Protocol (UDP), and the like. When the sending end 101 and the receiving end 102 communicate with each other through a transmission protocol of the wireless communication system, a transmission protocol layer corresponding to the transmission protocol may include a physical layer, a data link layer, and a transport layer.

When the sending end 101 needs to send the third transport block to the receiving end 102, the sending end 101 encodes the third transport block to obtain a second transport block, and sends the second transport block to the receiving end 102. The receiving end 102 receives the first transmission block sent by the sending end 101, and decodes the first transmission block to obtain a third transmission block.

The process of the sending end 101 encoding the third transmission block to obtain the second transmission block may be as follows:

in the transport layer of the sending end 101, the sending end 101 adds the header information of the transport layer to the third transport block, and sends the third transport block to which the header information of the transport layer is added to the data link layer of the sending end 101. In the data link layer, the transmitting end 101 adds the header information of the data link layer to the third transport block to which the header information of the transport layer is added, and transmits the third transport block to which the header information of the transport layer and the header information of the data link layer are added to the physical layer of the transmitting end 101. The sending end 101 encodes the third transport block to which the header information of the transport layer and the header information of the data link layer are added by using a channel encoder of the physical layer, and obtains a second transport block. The transmitting end 101 transmits the second transport block to the receiving end 102.

The receiving end 102 receives the second transport block sent by the sending end 101, and decodes the second transport block through a channel decoder of a physical layer of the receiving end 102 to obtain a third transport block. The channel decoder decodes the second transmission block to obtain a third transmission block, and the process of obtaining the third transmission block may be as follows:

and the channel decoder decodes the second transmission block according to the first demodulation information of the second transmission block to obtain a fourth transmission block. If the fourth transport block is the same as the third transport block, the channel decoder determines that decoding of the second transport block was successful. If the fourth transport block and the third transport block are not the same, the channel decoder determines that decoding of the second transport block failed.

In the embodiment of the present disclosure, the header information of the transport protocol layer in the transport block sent by the sending end to the receiving end has correlation; therefore, the receiving end 102 may set the priori information estimation module in the data link layer of the receiving end 102. When the receiving end 102 decodes the received transmission block successfully, the receiving end 102 extracts the header information of the transmission protocol layer of the transmission block successfully decoded through a priori information estimation module in the data link layer to obtain the priori information.

In a possible design provided by the embodiment of the present disclosure, when the receiving end 102 fails to decode the second transport block, the receiving end 102 may decode the second transport block by combining the prior information and the first demodulation information of the transport block whose decoding history is successful. Wherein the first demodulation information may include demodulation information of system bits and demodulation information of check bits of the second transport block. The demodulation information may be a demodulation soft value. The prior information is the header information of the transmission protocol layer of the transmission block which is decoded successfully in history. And decoding the second transmission block by combining the first prior information and the first demodulation information, thereby improving the accuracy of decoding.

The transmitting end 101 may be a terminal or a base station; the receiving end 102 may also be a terminal or a base station. The terminal can be a mobile phone terminal or a computer terminal. When the wireless communication system is an LTE system, the base station may be an Evolved Node B (eNodeB). When the wireless communication system is UMTS, the base station may be a NodeB. The third transport block may be service data or feedback information. The feedback information may be an ACK or a Negative Acknowledgement (NACK).

Referring to fig. 2, an embodiment of the present disclosure provides a decoding method, and an execution subject of the decoding method may be a receiving end. As shown in fig. 2, the method includes:

step 201: the receiving end extracts at least one priori information from at least one first transmission block which is successfully decoded historically, and the at least one priori information is combined into a priori information set.

Before decoding the received transmission blocks, the receiving end trains to obtain a prior information set according to at least one first transmission block successfully decoded in history. Accordingly, this step can be implemented by the following step 2011-.

Step 2011: the receiving end obtains at least one first transmission block and extracts the header information of the transmission protocol layer in each first transmission block in the at least one first transmission block.

And the receiving end stores the first transport blocks which are successfully decoded in the history into a transport block set, wherein the transport block set comprises at least one first transport block. When training obtains a priori information set, the receiving end obtains at least one first transmission block from the transmission block set.

In one possible implementation, the receiving end also stores the decoding time of each transport block in the transport block set. Since the header information of the transport protocol layer of the transport block whose decoding time is closer to the current time has a higher correlation with the header information of the transport protocol layer of the currently decoded transport block. Therefore, the step of the receiving end acquiring at least one first transport block may be:

and the receiving end selects a preset number of first transmission blocks with decoding time closest to the current time from the transmission block set according to the decoding time of each first transmission block in the transmission block set. The preset number may be set and changed as needed, and in the embodiment of the present disclosure, the preset number is not specifically limited. For example, the predetermined number may be 10 or 20, etc.

In the embodiment of the present disclosure, the header information of the transport protocol layer at least includes header information of a data link layer, and the header information of the transport protocol layer may further include header information of a transport layer. If the header information of the transport protocol layer includes header information of a data link layer; the step of the receiving end extracting header information of a transport protocol layer of each first transport block may be implemented in the following first manner. If the header information of the transport protocol layer includes header information of the data link layer and header information of the transport layer, for each first transport block, the step of the receiving end extracting the header information of the transport protocol layer of the first transport block may be implemented in the following second manner.

For the first implementation manner, the step of the receiving end extracting the header information of the transport protocol layer of the first transport block may be: the receiving end extracts the header information of the data link layer in the first transmission block.

Wherein the data link layer includes: a MAC layer, an RLC layer, and a PDCP layer. Accordingly, the header information of the data link layer includes at least one of header information of the MAC layer, header information of the RLC layer, and header information of the PDCP layer.

The header information of the MAC layer includes: logical Channel Identification (LCID), etc.

The header information of the RLC layer includes: a Serial Number (SN) Number of the RLC layer, and the like.

The header information of the PDCP layer includes: SN number of PDCP layer, etc.

For the second implementation manner, the step of the receiving end extracting the header information of the transport protocol layer of the first transport block may be:

and the receiving end extracts the head information of the data link layer and the head information of the transmission layer in the first transmission block and splices the head information of the data link layer and the head information of the transmission layer to obtain the head information of the transmission protocol layer.

The transport layer includes an Internet Protocol (IP) layer and a TCP layer. Accordingly, the header information of the transport layer includes, but is not limited to, any one of header information of an IP layer and header information of a TCP layer, and the like.

Wherein, the header information of the IP layer comprises: at least one of a version number + an IP header length (1 byte), a service type (1 byte), a total length of header information of the IP layer (2 bytes), a flag field + a fragmentation offset (2 bytes), a Time To Live (TTL) (1 byte), a transport Protocol (Protocol) (1 byte), a Source Address of the first transport block (Source Address) (4 bytes), and a Destination Address of the first transport block (Destination Address) (4 bytes).

The header information of the TCP layer includes: at least one of a source port + a destination port number (4 bytes) of the transmitting end, a sequence number (4 bytes) of the TCP layer, a data offset + a reserved field + a control field (2 bytes), and an urgent pointer (2 bytes).

It should be noted that the receiving end has a Robust Header Compression (RoHC) function. When the RoHC function is in the on state, the header information of the transport protocol layer includes header information of the data link layer, and the receiving end extracts the header information of the transport protocol layer of the first transport block by the above first method. When the RoHC function is in the off state, the header information of the transport protocol layer includes header information of the data link layer and header information of the transport layer, and the receiving end extracts the header information of the transport protocol layer of the first transport block through the above second manner.

Step 2012: the receiving end generates at least one prior information according to the header information of the transmission protocol layer in each first transmission block in the at least one first transmission block, and the prior information is formed into the prior information set.

For each first transport block, the step of generating, by the receiving end, prior information according to the header information of the transport protocol layer of the first transport block may be:

the receiving end uses the head information of the transmission protocol layer of the first transmission block as prior information. Alternatively, the first and second electrodes may be,

and the receiving end determines the header information of the transmission protocol layer of the next transmission block according to the header information of the transmission protocol layer of the first transmission block, and takes the determined header information of the transmission protocol layer of the next transmission block as prior information.

It should be noted that, the header information of the transport protocol layers in a plurality of transport blocks sent by the sending end at the same time has correlation, and during actual transmission, the header information of the transport protocol layers includes first header information and second header information; for each transport block, the first header information is header information whose values are the same in each transport block, and the second header information is information generated based on header information in other transport blocks. For example, the first header information may be: a Source port + a target port number (4 bytes) of a TCP layer, a Source Address (4 bytes) of an IP layer, a Destination Address (4 bytes) and the like; the second header information may be: SN number of PDCP layer, SN number of RLC layer, etc. Correspondingly, the step of determining, by the receiving end, the header information of the transport protocol layer of the next transport block according to the header information of the transport protocol layer of the first transport block may be:

and the receiving end determines third header information according to the second header information and a preset rule of the transmission protocol layer of the first transmission block, and the first header information and the third header information of the transmission protocol layer of the first transmission block form header information of the transmission protocol layer of the next transmission block.

The preset rule may be set and changed as needed, and in the embodiment of the present disclosure, the preset rule is not specifically limited. For example, the preset rule may be to add one to the SN number of the PDCP layer or one to the SN number of the RLC layer, etc.

For example, taking the sequence number of the PDCP layer in the header information of the transport protocol layer in the first transport block as an example, the sequence number of the PDCP layer may be binary data with a length of 8 bits: 00000001, for each bit of binary data included in the serial number, binary data of each bit from 1 st bit to 7 th bit is 0, and prior information generated by the receiving end according to the binary data of each bit from 1 st bit to 7 th bit may be 10, where binary data 1 of 1 st bit in the prior information indicates that the information of the serial number is 0 is extracted, and binary data 0 of 2 nd bit in the prior information is a value of the serial number at the bit; the 8 th bit of binary data in the serial number is 1, and the prior information generated by the receiving end according to the 8 th bit of binary data may be 11, where the 1 st bit of binary data 1 in the prior information indicates that the information of the serial number is 1 is extracted, and the 2 nd bit of binary data 1 in the prior information is the information of the serial number at the 8 th bit.

In a possible design provided by the embodiment of the present disclosure, a receiving end may set a priori information estimation module in a data link layer, where the priori information estimation module is configured to extract priori information from at least one first transmission block in which historical decoding is successful, and form a priori information set, as shown in fig. 3, the receiving end extracts header information of the data link layer and header information of the transmission layer in the at least one first transmission block in which historical decoding is successful through the priori information estimation module, generates at least one piece of priori information, and forms the at least one piece of priori information into the priori information set.

When the receiving end needs to decode through the channel decoder of the physical layer, the receiving end sends the first prior information in the prior information set to the channel decoder of the physical layer through the prior information pre-estimation module of the data link layer. The receiving end extracts the prior information through the prior information pre-estimation module, and the step of forming the prior information set can be as follows: when the receiving end successfully decodes at least one first transmission block through a channel decoder of a physical layer, the receiving end sends the at least one first transmission block successfully decoded in history to a data link layer; then, the receiving end extracts the head information of the transmission protocol layer in at least one first transmission block of which the historical decoding is successful through a priori information estimation module of a data link layer to generate at least one piece of priori information; the at least one prior information is grouped into a set of prior information.

The first transmission block may be set and changed according to a user requirement, and the first transmission block is not specifically limited in the embodiment of the present disclosure, for example, the first transmission block may be a transmission block for which a sending end performs an affirmative response on received service data, or a transmission block for which a sending end performs a negative response on received service data; the first transport block may also be a transport block of traffic data received by the receiving end.

For example, the transmission block for acknowledging the received service data by using the first transmission block as the transmitting end is taken as an example for description, the receiving end may be a base station, the transmitting end may be a terminal, and the terminal may send the first transmission block for acknowledging the acknowledgement to the base station after receiving the service data sent by the base station. And the base station receives the first transmission block of the confirmation response, so that the terminal is informed of confirming the reception of the service data sent by the base station.

The above step 201 is a process of generating the prior information set by the receiving end. The above step 201 is usually performed only once, and when the received transport block is decoded subsequently, the step 201 is not required to be performed, and the step 202 is directly performed.

When the sending end sends the third transmission block to the receiving end, in order to improve the transmission efficiency, the sending end codes the third transmission block to obtain a second transmission block, and sends the second transmission block to the receiving end. The receiving end receives the second transport block sent by the sending end, and executes step 202.

The step of coding the third transmission block by the sending end to obtain the second transmission block may be:

and the sending end loads the third transmission block in the header information of the transmission layer and sends the header information of the transmission layer to a data link layer of the sending end. In the Data link layer, the transmitting end adds header information of the PDCP layer to header information of the transport layer, generates Protocol Data Unit (PDU) information, and transmits the PDU information to the RLC layer of the Data link layer. In the RLC layer, the transmitting end segments and concatenates the PDU information, adds the head information of the RLC layer and transmits the PDU information added with the head information of the RLC layer to the MAC layer. And at the MAC layer, the sending end adds the head information of the MAC layer in the PDU information added with the head information of the RLC layer to obtain a second transmission block.

As shown in fig. 3, when the receiving end decodes the second transport block for the first time, the receiving end may directly decode the second transport block according to the first demodulation information without combining the prior information. When the decoding fails, step 202 is executed to decode the second transport block by combining the first demodulation information and the prior information. Wherein the first demodulation information of the second transport block may include demodulation information of the systematic bits and demodulation information of the parity bits. The system bits are used for carrying service data or feedback information. The check bits are used for carrying check information.

And the receiving end decodes the second transmission block according to the first demodulation information to obtain a fourth transmission block. The receiving end determines whether the fourth transport block and the third transport block are identical. And if the fourth transmission block is the same as the third transmission block, determining that the decoding is successful. And if the fourth transmission block is not the same as the third transmission block, determining that the decoding fails.

The step of the receiving end determining whether the fourth transport block and the third transport block are the same may be:

and the receiving end acquires first check information and second check information, wherein the first check information is check information of the third transmission block, and the second check information is check information of the fourth transmission block. The receiving end determines whether the first check information and the second check information are the same. And if the first check information is the same as the second check information, the receiving end determines that the fourth transmission block is the same as the third transmission block. And if the first check information is not the same as the second check information, the receiving end determines that the fourth transmission block is not the same as the third transmission block.

And the sending end generates first check information according to a preset check algorithm and the third transmission block. When the sending end sends the second transport block to the receiving end, the first check information may be carried in the second transport block and sent to the receiving end. The transmitting end may also separately transmit the first check information to the receiving end before or after transmitting the second transport block to the receiving end. Correspondingly, the step of the receiving end acquiring the first check information may be:

and the receiving end acquires the first check information from the second transmission block. Or, the receiving end receives the first check information sent by the sending end.

It should be noted that the transmission blocks sent by the sending end to the receiving end are all encoded transmission blocks, that is, the sending end encodes the first check information to obtain third check information, and sends the third check information to the receiving end. Correspondingly, the step of the receiving end obtaining the first check information from the second transport block may be:

and the receiving end acquires the demodulation information of the check bit in the first demodulation information of the second transmission block, and decodes the third check information in the second transmission block according to the demodulation information of the check bit to obtain the first check information.

And when the receiving end acquires the second check information, the receiving end generates the second check information according to the preset check algorithm and the fourth transmission block.

The preset verification algorithm may be set and changed as needed, and in the embodiment of the present disclosure, the preset verification algorithm is not specifically limited. For example, the predetermined Check algorithm may be a Cyclic Redundancy Check (CRC) algorithm.

In a possible implementation manner, when the decoding is successful, the receiving end extracts the prior information from the third transmission block, and updates the prior information set according to the extracted prior information.

When the receiving end updates the prior information set according to the extracted prior information, the receiving end can directly add the extracted prior information into the prior information set. The receiving end can also replace the prior information of the transmission block which is farthest from the current time and is decoded successfully in the prior information set with the extracted prior information.

The process of the receiving end extracting the prior information from the third transmission block is similar to the process of the receiving end extracting the prior information from the first transmission block, and is not repeated here.

Step 202: when a second transmission block to be decoded sent by the sending end is received, the receiving end selects first prior information from the prior information set, and the second transmission block is a transmission block obtained by coding a third transmission block by the sending end.

When the receiving end selects the first prior information from the prior information set, the receiving end may randomly select one prior information from the prior information set, and use the selected prior information as the first prior information. The receiving end may also select, according to the decoding success time corresponding to each priori information in the priori information set and according to the decoding success time corresponding to each priori information, the priori information that is decoded successfully closest to the current time from the priori information set, and use the selected priori information as the first priori information.

It should be noted that, in this step, the receiving end may select one priori information from the set of priori information, or may select multiple pieces of priori information.

In a possible design provided by the embodiment of the present disclosure, to improve security, the sending end may further perform encryption processing on the third transport block, and encode the encrypted third transport block to obtain the second transport block. At this time, the receiving end needs to decode the second transport block by using the encrypted prior information. Correspondingly, the step of the receiving end selecting the first priori information from the set of priori information may be:

the receiving end selects third prior information from the prior information set, wherein the third prior information is the prior information extracted by the receiving end from the encrypted first transmission block; determining a first encryption key according to a sixth transmission block, wherein the sixth transmission block is a transmission block successfully decoded last time of the second transmission block; and encrypting the third prior information through the first encryption key to obtain the first prior information.

In this embodiment of the present disclosure, the sending end may encrypt the third transport block in the PDCP layer, where the step may be: in the PDCP layer, a sending end acquires a parameter quintuple in the PDCP layer, generates a first encryption key according to the parameter quintuple and a preset encryption algorithm, and carries out encryption operation on the third transmission block through the first encryption key to obtain an encrypted third transmission block.

Wherein the parameter quintuple may include: KEY (KEY), COUNT (COUNT), BEARER (BEARER), DIRECTION (DIRECTION), LENGTH (LENGTH). The parameters KEY, BEARER, DIRECTION and LENGTH in each transmission block have the same value, and the parameter COUNT has different values. I.e. a number of transport blocks, the parameter that varies is COUNT.

The parameter COUNT is composed of a Hyper Frame Number (HFN) and a PDCP Sequence Number (SN), where the HFN and the PDCP SN are used to describe a sequence Number corresponding to a third transport block sent by the sending end. And the value of the HFN is only related to the value of the PDCP SN, namely, the sending end sends a transmission block to the receiving end every time, the value of the PDCP SN is increased by a first preset value, when the value of the PDCP SN reaches the maximum value, the HFN is increased by a second preset value, and the value of the PDCP SN is cleared. The first preset value or the second preset value may be set and changed according to a user requirement, which is not specifically limited in the embodiment of the present disclosure. For example, the first preset value and the second preset value may both be 1.

The step of determining, by the receiving end, the first encryption key according to the sixth transport block may be: and the receiving end extracts a second encryption key from the sixth transmission block, and determines a first encryption key according to the second encryption key and a preset key algorithm.

And the second encryption key is a key stream when the sending end encrypts the sixth transport block. The receiving end extracts a second encryption key from the sixth transmission block: the encryption method comprises the steps of determining a first KEY, a first COUNT, a first BEARER, a first DIRECTION and a first LENGTH according to the first KEY, determining a second COUNT according to the first COUNT, and combining the first KEY, the second COUNT, the first BEARER, the first DIRECTION and the first LENGTH into a first encryption KEY.

The step of determining, by the receiving end, the second COUNT according to the first COUNT may be:

and the receiving end increases the value of the PDCP SN in the first COUNT by a first preset value to obtain a second COUNT.

It should be noted that, the third priori information is encrypted through the first encryption key and the preset encryption algorithm to obtain the first priori information. The preset encryption operation may be set and changed according to a user requirement, which is not specifically limited in this disclosure. For example, the predetermined encryption operation may be: and carrying out bitwise exclusive-or operation. Correspondingly, the receiving end carries out bitwise XOR operation on the first encryption key and the third prior information to obtain first prior information.

The receiving end sends the first apriori information from the data link layer to the physical layer, so that the channel decoder of the physical layer decodes the second transport block by using the first apriori information and the first demodulation information through the following step 203.

Step 203: and the receiving end decodes the second transmission block according to the first prior information and the first demodulation information of the second transmission block to obtain the third transmission block.

This step can be achieved by the following step 2031-2032, which includes:

step 2031: and the receiving terminal performs saturation processing on the first demodulation information according to the first prior information to obtain second demodulation information.

Wherein the first demodulation information comprises demodulation information corresponding to system bits of the second transport block. The first demodulation information includes a plurality of first demodulation sub-information, and one first demodulation sub-information corresponds to system bit information of one unit bit of the second transport block. The first a priori information includes a plurality of a priori sub information. One first demodulation sub-information corresponds to one a priori sub-information. For each priori sub-information, the receiving end performs saturation processing on the priori sub-information through a preset saturation algorithm to obtain second demodulation sub-information, and the second demodulation sub-information corresponding to each priori sub-information forms second demodulation information.

Each of the a priori sub information includes identification information of one unit bit and header information of a transport protocol layer of one unit bit of the first transport block. For each a priori sub-information, the identification information in the a priori sub-information is used to identify whether header information of a transport protocol layer in the a priori sub-information is used for decoding a second transport block. The receiving end sets first preset information and second preset information in advance. The first preset information is used for identifying that the receiving end carries out saturation processing on each first demodulation sub-information through a first saturation processing mode. The second preset information is used for identifying that the receiving end carries out saturation processing on each first demodulation sub-information through a second saturation processing mode. The first saturation treatment mode is as follows: and modifying the information of the preset bit in the first demodulation sub-information into a third preset value, and modifying the information of other bits except the preset bit in the first demodulation sub-information into a fourth preset value. The second saturation treatment mode is as follows: and modifying the information of the preset bit in the first demodulation sub-information into a fifth preset value, and modifying the information of other bits except the preset bit in the first demodulation sub-information into a fourth preset value.

Correspondingly, the step of performing saturation processing on the prior sub-information by the receiving end through a preset saturation algorithm to obtain second demodulation sub-information may be:

if the identification information identifies that the header information of the transmission protocol layer in the prior sub-information is used for decoding a second transmission block, and the prior sub-information is first preset information, for the first demodulation sub-information corresponding to the prior sub-information, the receiving end modifies the information of the preset bit in the first demodulation sub-information into a third preset value, and modifies the information of other bits except the preset bit in the first demodulation sub-information into a fourth preset value, so as to obtain second demodulation sub-information. Alternatively, the first and second electrodes may be,

if the identification information identifies that the header information of the transmission protocol layer in the prior sub-information is used for decoding a second transmission block and the prior sub-information is second preset information, for the first demodulation sub-information corresponding to the prior sub-information, the receiving end modifies the information of the preset bit in the first demodulation sub-information into a fifth preset value and modifies the information of other bits except the preset bit in the first demodulation sub-information into a fourth preset value to obtain second demodulation sub-information. Alternatively, the first and second electrodes may be,

if the identification information identifies that the header information of the transmission protocol layer in the prior sub-information is not used for decoding the second transmission block, the receiving end uses the first demodulation sub-information corresponding to the prior sub-information as second demodulation sub-information.

The first preset information and the second preset information are different. In addition, the first preset information and the second preset information may be set and changed as needed, which is not specifically limited in the embodiment of the present disclosure. For example, the a priori sub information is identified by binary data, the first preset information may be 11, and the second preset information may be 10.

The demodulation information may be a demodulation soft value, and the first demodulation information includes a demodulation soft value corresponding to information of each unit bit in the system bits of the second transport block. The preset bit may be set and changed according to a user requirement, which is not specifically limited in this disclosure. For example, for each unit bit of information in the systematic bits of the second transport block, it may correspond to 8 bits that are demodulation soft values, and the preset bit may be the 1 st bit or the 8 th bit among the 8 bits, and so on. For the demodulation soft value corresponding to the information of each unit bit, the preset bit is used for carrying information for identifying the demodulation soft value as a positive number or a negative number. When the preset bit information is 1, the demodulation soft value is represented as a positive number, and when the preset bit information is 0, the demodulation soft value is represented as a negative number.

The identification information in the prior sub-information may be set and changed according to the user requirement, which is not specifically limited in the embodiment of the present disclosure. For example, if the a priori sub information is represented by binary data, the identification information in the a priori sub information may be binary data 0 or 1. If the identification information in the prior sub-information is 1, the receiving end determines that the header information of the transmission protocol layer in the prior sub-information is used for decoding a second transmission block; if the identification information in the prior sub-information is 0, the receiving end determines that the header information of the transmission protocol layer in the prior sub-information is not used for decoding the second transmission block.

The third preset value is used for identifying that the demodulation soft value is a positive value. The fourth predetermined value is used to identify the value of each bit in the demodulated soft value. The fifth preset value is used to identify that the demodulation soft value is a negative value. The third preset value is the same as the fourth preset value, and the third preset value (or the fourth preset value) is different from the fifth preset value. In addition, the third preset value, the fourth preset value and the fifth preset value may be set and changed according to a user requirement, which is not specifically limited in the embodiment of the present disclosure. For example, the third predetermined value is 1, the fourth predetermined value is 1, the fifth predetermined value is 0, and so on.

For example, taking the demodulation information as the demodulation soft value as an example, if the bit width of the demodulation soft value corresponding to the information of each unit bit in the system bits of the second transport block is 8 bits, where the preset bit is the 1 st bit and the remaining 7 bits are used to carry a specific value of the demodulation soft value. The bit width of one priori sub information may be 2 bits, where a 1 st bit is used to carry identification information, a 2 nd bit is used to carry header information of a transport protocol layer, when the identification information is 1, the header information of the transport protocol layer in the priori sub information is used to decode a second transport block, when the identification information is 0, the header information of the transport protocol layer in the priori sub information is not used to decode the second transport block, and when the identification information is 1, the first preset information may be 11, the second preset information may be 10, the third preset value may be 1, the fourth preset value may be 1, and the fifth preset value may be 0; when the identification information is 0, the a priori sub information may be 01 or 00. Correspondingly, for a demodulation soft value corresponding to information of a kth bit in system bits of the second transport block, performing saturation processing on the demodulation soft value by using the following formula one:

where k represents the kth bit in the second transport block, LLR₀A demodulated soft value corresponding to information of a k-th bit in systematic bits of the second transport block,llr (k) represents the demodulated soft value after saturation processing, and bit (k) is a priori sub-information corresponding to information of the kth bit in the systematic bits of the second transport block. When bit (k) is 2, that is, bit (k) is 10, modifying the value of the preset bit in the soft demodulation value to 0, and modifying the values of the other bits except the preset bit in the soft demodulation value to 1, to obtain a soft demodulation value 01111111 after saturation processing, that is, llr (k) is-127; if bit (k) is 3, that is, if bit (k) is 11, modifying the value of the preset bit in the soft demodulation value to 1, and modifying the values of the bits other than the preset bit in the soft demodulation value to 1, to obtain a soft demodulation value 11111111111 after saturation processing, that is, llr (k) is 127; when bit (k) is 0 or 1, that is, bit (k) is 00 or 01, the receiving end directly compares the LLR₀As llr (k).

In the embodiment of the present disclosure, the receiving end performs saturation processing on the first demodulation information through the first priori information to obtain second demodulation information, where the first priori information includes header information of a transport protocol layer, and the header information of the transport protocol layer in the second transport block has correlation with the header information of the transport protocol layer of the first transport block. Therefore, the receiving end decodes the second transmission block through the second demodulation information, thereby improving the accuracy of decoding the second transmission block.

In this embodiment of the present disclosure, as shown in fig. 3, the receiving end may set a processing module in the physical layer, configured to perform saturation processing on the first demodulation information to obtain second demodulation information, where the process may be: after the receiving end sends the first prior information to the physical layer from the data link layer, the receiving end receives the first prior information through a processing module of the physical layer, and performs saturation processing on the first demodulation information through the processing module by using the first prior information and a preset saturation algorithm to obtain second demodulation information.

Step 2032: and the receiving end decodes the second transmission block according to the second demodulation information to obtain the third transmission block.

In this step, the receiving end decodes the second transport block according to the second demodulation information to generate a fifth transport block. And the receiving end judges whether the fifth transmission block and the third transmission block are the same. And if the fifth transmission block is the same as the third transmission block, the receiving end determines that the decoding of the second transmission block is successful. And if the fifth transmission block is not the same as the third transmission block, the receiving end determines that the decoding of the second transmission block fails. And if the second transmission block is successfully decoded, ending the decoding. If the decoding of the second transmission block fails, the receiving end selects second prior information from the prior information set, wherein the second prior information is any prior information except the first prior information in the prior information set; and the receiving end repeatedly decodes the second transmission block according to the second prior information and the first demodulation information until the decoding is successful to obtain the third transmission block.

In this embodiment of the present disclosure, when the receiving end successfully decodes the second transport block, the receiving end sends a third transport block from the physical layer to the data link layer, and updates the prior information set in the data link layer according to the third transport block, where the process may be: the receiving end extracts prior information from the third transmission block; and updating the prior information set according to the extracted prior information.

In a possible design provided in the embodiment of the present disclosure, as shown in fig. 3, when the receiving end successfully decodes the second transmission block, the receiving end may store and update the prior information set through a prior information estimation module of a data link layer, where the step may be: and the receiving end extracts prior information from the third transmission block through a prior information pre-estimation module of a data link layer, adds the extracted prior information into a prior information set to obtain an updated prior information set, and stores the updated prior information set.

The following are embodiments of an apparatus of an embodiment of the disclosure that may be used to perform method embodiments of an embodiment of the disclosure. For details not disclosed in the embodiments of the apparatus of the embodiments of the present disclosure, please refer to the embodiments of the method of the embodiments of the present disclosure.

Fig. 4 is a block diagram of an apparatus for decoding, which may be applied in a receiving end, according to an embodiment of the present disclosure, and the apparatus includes: a first extraction unit 301, a selection unit 302 and a first decoding unit 303.

A first extraction unit 301 for performing step 201 and its alternatives in the above described embodiments.

A selection unit 302 for performing step 202 and its alternatives in the above described embodiments.

A first decoding unit 303 for performing step 203 and its alternatives in the above embodiments.

Referring to fig. 5, the apparatus includes a second decoding unit 304.

A second decoding unit 304 for performing step 202 and its alternatives in the above embodiments.

Referring to fig. 6, the apparatus includes an acquisition unit 305 and a determination unit 306.

An obtaining unit 305 for performing step 202 and its alternatives in the above embodiments.

A determination unit 306 for performing step 202 and its alternatives in the above embodiments.

Referring to fig. 7, the apparatus includes a second extraction unit 307 and an update unit 308.

A second extraction unit 307 for performing step 203 and its alternatives in the above described embodiments.

An updating unit 308 for performing step 203 and its alternatives in the above embodiments.

It should be noted that: in the decoding apparatus provided in the above embodiment, only the division of the above functional modules is used for illustration during decoding, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. In addition, the decoding apparatus and the decoding method provided in the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.

The disclosed embodiment provides a receiving end, and referring to fig. 8, the device includes a network interface 801, a memory 802, and a processor 803.

The network interface 801 is used to receive transport blocks;

memory 802 is used to store instructions and data;

a processor 803, configured to read instructions and data stored in the memory 802, and execute:

when a second transmission block to be decoded sent by a sending end is received, selecting first prior information from the prior information set, wherein the second transmission block is a transmission block obtained by coding a third transmission block by the sending end;

The embodiment of the present disclosure provides a system chip, which is applied to a receiving end, referring to fig. 9, the system chip includes: an input output interface 901, at least one processor 902, a memory 903, and a bus 904; the i/o interface 901 is connected to the at least one processor 902 and the memory 903 through the bus 904, the i/o interface 901 is used for communication between the receiving end and the transmitting end, and the at least one processor 902 executes instructions stored in the memory, so that the receiving end performs the steps performed by the receiving end as described above.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A method of coding, the method comprising:

when a second transmission block to be decoded sent by a sending end is received, decoding the second transmission block according to first demodulation information of the second transmission block to obtain a fourth transmission block, wherein the second transmission block is obtained by coding a third transmission block by the sending end;

if the first check information is different from the second check information, determining that the fourth transmission block is different from the third transmission block;

selecting first prior information from the set of prior information;

2. The method of claim 1, wherein the extracting at least one prior information from at least one first transport block with historical decoding success, and grouping the at least one prior information into a set of prior information comprises:

obtaining the at least one first transport block;

and forming the at least one prior information into the prior information set.

3. The method according to claim 1 or 2, wherein after the decoding the second transport block according to the first apriori information and the first demodulation information of the second transport block to obtain the third transport block, the method further comprises:

extracting a priori information from the third transport block;

4. The method according to any of claims 1-2, wherein the decoding the second transport block according to the first apriori information and the first demodulation information of the second transport block to obtain the third transport block comprises:

5. The method of claim 4, wherein the decoding the second transport block according to the second demodulation information to obtain the third transport block comprises:

6. The method according to claim 1, wherein the second transport block is a transport block obtained by encrypting the third transport block by the sending end; the selecting first prior information from the set of prior information comprises:

selecting third prior information from the prior information set, wherein the third prior information is the prior information extracted by a receiving end from the encrypted first transmission block;

7. The method of claim 6, wherein determining the first encryption key according to the sixth transport block comprises:

extracting a second encryption key from the sixth transport block;

8. An apparatus for decoding, the apparatus comprising:

a first extracting unit, configured to extract at least one priori information from at least one first transport block with successful historical decoding, and form the at least one priori information into a priori information set, where one priori information includes header information of a transport protocol layer of the first transport block;

the selection unit is used for selecting first prior information from the prior information set when a second transmission block to be decoded, which is sent by a sending end, is received, wherein the second transmission block is a transmission block obtained by coding a third transmission block by the sending end;

a first decoding unit, configured to decode the second transport block according to the first priori information and first demodulation information of the second transport block, so as to obtain a third transport block;

the device further comprises:

a second decoding unit, configured to decode the second transport block according to the first demodulation information to obtain a fourth transport block;

the selecting unit is further configured to select first apriori information from the apriori information set if the fourth transport block is different from the third transport block;

the device further comprises:

an obtaining unit, configured to obtain first check information and second check information, where the first check information is check information of the third transmission block, and the second check information is check information of the fourth transmission block;

a determining unit, configured to determine that the fourth transport block is different from the third transport block if the first parity information is different from the second parity information.

9. The apparatus of claim 8,

the first extraction unit is further configured to obtain the at least one first transport block;

the first extracting unit is further configured to extract header information of a transport protocol layer in each of the at least one first transport block;

the first extraction unit is further configured to generate at least one piece of prior information according to header information of a transport protocol layer in each of the at least one first transport block;

the first extraction unit is further configured to compose the at least one piece of prior information into the set of prior information.

10. The apparatus of claim 8 or 9, further comprising:

a second extraction unit, configured to extract prior information from the third transport block;

and the updating unit is used for updating the prior information set according to the extracted prior information.

11. The apparatus according to any one of claims 8 to 9,

the first decoding unit is further configured to perform saturation processing on the first demodulation information according to the first priori information to obtain second demodulation information;

the first decoding unit is further configured to decode the second transport block according to the second demodulation information, so as to obtain the third transport block.

12. The apparatus of claim 11,

the first decoding unit is further configured to decode the second transport block according to the second demodulation information to obtain a fifth transport block;

the first decoding unit is further configured to select second apriori information from the apriori information set if the fifth transport block and the third transport block are different, where the second apriori information is any apriori information in the apriori information set except for the first apriori information;

the first decoding unit is further configured to decode the second transport block according to the second priori information and the first demodulation information, so as to obtain the third transport block.

13. The apparatus according to claim 8, wherein the second transport block is a data block obtained by encrypting the third transport block by the sending end;

the selecting unit is further configured to select third apriori information from the apriori information set, where the third apriori information is apriori information extracted by the receiving end from the encrypted first transport block;

the selecting unit is further configured to determine a first encryption key according to a sixth transport block, where the sixth transport block is a transport block of the second transport block, and the decoding of the sixth transport block is successful;

the selecting unit is further configured to encrypt the third apriori information by using the first encryption key to obtain the first apriori information.

14. The apparatus of claim 13,

the selecting unit is further configured to extract a second encryption key from the sixth transport block;

the selection unit is further configured to determine the first encryption key according to the second encryption key and a preset key algorithm.